In 1619 Johannes Kepler set out to hear the harmony of the heavens. He gave every planet a voice that rises as it speeds up near the Sun and falls as it slows down far from it. Here the planets move on their real orbits, from today's positions, and sing Kepler's way. Press Listen. Curious about the idea? Read about the music of the spheres.
The choir
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Planets
Kepler knew six planets. Add Uranus and Neptune to hear the rest of the choir.
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Kepler's intervals
How much faster each planet moves at its closest to the Sun than at its farthest, as an interval: the range its voice slides over in one orbit. The ratio is computed from today's orbits; Kepler worked from Tycho Brahe's observations and heard slightly different intervals in places.
| Planet | Eccentricity | Fastest รท slowest | Nearest interval | Kepler heard |
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